Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c12680b8e97c16…

MALICIOUS

PDF

126.4 KB Created: 2021-09-07 19:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 133ae432f0e1f33124dce26cd144afb9 SHA-1: cce58d783ca58a9d365ab5892c1dcdfe405b0aaa SHA-256: 43c12680b8e97c16fda972c3d439980828f7371d32f80b44b7375356574b5171
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The file's purpose appears to be to lure users into clicking links that lead to further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dff2c2f2df---tagapinidaduligufosutuv.pdf In PDF document text
    • http://dailyxedayhang.com/userfiles/files/dazevujorovabosipuz.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/7dff32958a23d7a4deb5ab5489274d8a/jopovogatinin.pdfIn PDF document text
    • http://mayjack.com/upload/files/fekamevodivimosukor.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/kesem.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e74f71adda---botopegusafezu.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//gokoloj.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/86650592936.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/mos7oeq5canojm31hteb1q9lf4/sewazejuvumazi.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/9b7349b7ac0ade9257e8e0308e68f611/pilizadokexukefigelevebad.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/940bd98e450ae10cb62345ffb0754f16/60464147767.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/lemaxigexibuwobimav.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160985da33bcb8---24770400049.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fdc10d42757---pezuzovewabutegorevisene.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/7852931526.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/23703422473.pdfIn PDF document text
    • https://equimat-cheval.fr/file/wivujutoladeponisinuxe.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/78109550764.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/20313281334.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/666f01c21d40ac0f68f1211322c48b4a/zuvud.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/65c497bfb6848875372a641c4c6fa5dc/vexoselanufi.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/zobixonipuwuzafazipezodo.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/jumes.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2121eadeac---sazevurazijusinet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=aristophane+les+gu%C3%AApes+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A69 11016 bytes
SHA-256: 916345f1cbca5f92252aa22ca9d1982ce4b8eca3c02e4d8f416672c27da10a20
font_01_sfnt_off00019384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ab96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB96 25164 bytes
SHA-256: 7a5dabdfa04ed35cd84493d6b5446be816a491d896d45c1ecf3358b412198fdc

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